Anodic modification-enhanced microbial electrolysis cell coupled with anaerobic digestion for coal gasification wastewater treatment

IF 3.7 3区生物学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Biochemical Engineering Journal Pub Date : 2025-05-07 DOI:10.1016/j.bej.2025.109767

Yajie Li , Yuyao Zhang , Ou Wang , Weikang Kong , Salma Tabassum

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Abstract

The treatment of coal gasification wastewater (CGW) by anodic modification enhanced microbial electrolysis cell coupled with anaerobic digestion was discussed. In this study, iron sulfate was used to load modified biochar to obtain anode modified materials. The results showed that the electrode modification effectively improved the specific surface area of the graphite felt electrode, The conductivity of modified Fe₂(SO₄)₃ activated carbon was 191.4 ± 0.16 μS/cm, Fe-O-C functional groups boost electrode surface electron transfer. Three reactors were set up as the experimental groups: the anaerobic (AD) reactor (R1) as the control group, the microbial electrolysis cell coupled anaerobic digestion (MEC-AD) reactor (R2) and, the anode modified microbial electrolysis cell coupled anaerobic digestion (MEC-AD) reactor (R3). The results showed that R1, R2 and R3 had average removal rates of total phenol by 41 %, 48 % and 67 %, respectively. The degradation trend of quinoline and indole in R1, R2 and R3 was similar to that of total phenol. The degradation rates of quinoline and indole in R3 were the highest, reaching 86 % and 89 %, respectively. The electrode modification is beneficial to improve the treatment effect of MEC-AD. In addition, electrode modification promoted the enrichment of electroactive microorganisms such as Syntrophus and Pseudomonas, which was conducive to promoting direct interspecies electron transfer (DIET) and enhancing the degradation of organic pollutants.

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阳极改性强化微生物电解池耦合厌氧消化处理煤气化废水

探讨了阳极改性强化微生物电解池联合厌氧消化处理煤气化废水。本研究采用硫酸铁负载改性生物炭制备阳极改性材料。结果表明，电极修饰有效提高了石墨毡电极的比表面积，修饰后的Fe2(SO4)3活性炭的电导率为191.4 ± 0.16 μS/cm， Fe-O-C官能团促进了电极表面电子转移。设置厌氧（AD）反应器（R1）作为对照组，微生物电解池耦合厌氧消化（MEC-AD）反应器（R2）和阳极改性微生物电解池耦合厌氧消化（MEC-AD）反应器（R3）作为试验组。结果表明，R1、R2和R3对总酚的平均去除率分别为41 %、48 %和67 %。喹啉和吲哚在R1、R2和R3中的降解趋势与总酚相似。喹啉和吲哚在R3中的降解率最高，分别达到86 %和89 %。电极修饰有利于提高MEC-AD的处理效果。此外，电极修饰促进了合胞菌和假单胞菌等电活性微生物的富集，有利于促进直接种间电子转移（DIET），增强对有机污染物的降解。

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来源期刊

Biochemical Engineering Journal 工程技术-工程：化工

CiteScore

7.10

自引率

5.10%

发文量

380

审稿时长

34 days

期刊介绍： The Biochemical Engineering Journal aims to promote progress in the crucial chemical engineering aspects of the development of biological processes associated with everything from raw materials preparation to product recovery relevant to industries as diverse as medical/healthcare, industrial biotechnology, and environmental biotechnology. The Journal welcomes full length original research papers, short communications, and review papers* in the following research fields: Biocatalysis (enzyme or microbial) and biotransformations, including immobilized biocatalyst preparation and kinetics Biosensors and Biodevices including biofabrication and novel fuel cell development Bioseparations including scale-up and protein refolding/renaturation Environmental Bioengineering including bioconversion, bioremediation, and microbial fuel cells Bioreactor Systems including characterization, optimization and scale-up Bioresources and Biorefinery Engineering including biomass conversion, biofuels, bioenergy, and optimization Industrial Biotechnology including specialty chemicals, platform chemicals and neutraceuticals Biomaterials and Tissue Engineering including bioartificial organs, cell encapsulation, and controlled release Cell Culture Engineering (plant, animal or insect cells) including viral vectors, monoclonal antibodies, recombinant proteins, vaccines, and secondary metabolites Cell Therapies and Stem Cells including pluripotent, mesenchymal and hematopoietic stem cells; immunotherapies; tissue-specific differentiation; and cryopreservation Metabolic Engineering, Systems and Synthetic Biology including OMICS, bioinformatics, in silico biology, and metabolic flux analysis Protein Engineering including enzyme engineering and directed evolution.